TREA

Roy D. Hoffer

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  • Lancaster, PA, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    AC motor drive system
    • Patent number 5,146,147
    • Issue date Sep 8, 1992
    • York International Corporation
    • Frank E. Wills
    • H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • Information Patent Grant

    AC motor drive system
    • Patent number 5,136,216
    • Issue date Aug 4, 1992
    • York International Corporation
    • Frank E. Wills
    • H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • Information Patent Grant

    Electronically dimmed power limited lighting system
    • Patent number 4,798,998
    • Issue date Jan 17, 1989
    • Armstrong World Industries, Inc.
    • J. Marshall Hemphill
    • H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • Information Patent Grant

    Slow acting photo lamp control
    • Patent number 4,697,122
    • Issue date Sep 29, 1987
    • Armstrong World Industries, Inc.
    • Roy D. Hoffer
    • H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR